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Sagot :
This is the best I could do. I’m not sure if you want it in that form or not. But I have factored everything. Hope this helps.
Answer:
(³/₄·m - ²/₅·n)(³/₄·m + ⁷/₂·n) = ⁹/₁₆·m² + ⁹³/₄₀·mn - ⁷/₅·n²
Step-by-step explanation:
When multiplying multiple term expressions in brackets by one another, we need to multiply each term in one bracket by every term in the other bracket;
So:
(³/₄·m - ²/₅·n)(³/₄·m + ⁷/₂·n) = (³/₄·m × ³/₄·m) + (³/₄·m × ⁷/₂·n) + (-²/₅·n × ³/₄·m) + (-²/₅·n × ⁷/₂·n)
= ⁹/₁₆·m² + ²¹/₈·mn - ³/₁₀·mn - ⁷/₅·n²
= ⁹/₁₆·m² + ⁹³/₄₀·mn - ⁷/₅·n²
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